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Age-dependent changes in visual sensitivity induced by moving fixation points in adduction and abduction using imo
Takuhei Shoji1, Izumi Mine2, Tomoyuki Kumagai2
1Department of Ophthalmology, Saitama Medical University, 38 Morohongo Moroyama-machi, Iruma, Saitama, 350-0495, Japan. shoojii@gmail.com.
Scientific Reports
|December 4, 2020
Summary
This study introduces a new visual field (VF) test protocol with lateral gaze positions. Elderly individuals showed improved visual sensitivity with abduction fixation, suggesting its potential for diagnosing eye diseases.
Area of Science:
- Ophthalmology
- Neuroscience
- Vision Science
Background:
- Optic nerve head deformations can worsen optic neuropathies like glaucoma.
- Traditional visual field (VF) testing uses a fixed central gaze, potentially missing crucial information.
Purpose of the Study:
- To assess the feasibility of quantifying VF sensitivities at lateral horizontal gaze positions.
- To determine if horizontal gaze positions alter visual sensitivities differently across age groups.
Main Methods:
- Developed a novel static perimetry protocol incorporating 6° adduction and 6° abduction as fixation points.
- Compared VF sensitivities using central, adducted, and abducted fixation in healthy younger (≤45 years) and elderly (>45 years) adults.
- Utilized 24 plus (1) imo static perimetry for all tests.
Main Results:
- Younger subjects exhibited similar visual sensitivities across all three fixation points (central, adduction, abduction).
- Elderly subjects demonstrated significantly better visual sensitivity with abduction fixation compared to central gaze and adduction (p < 0.05).
- Average mean sensitivities were higher in younger adults (approx. 30 dB) than in elderly adults (approx. 28 dB).
Conclusions:
- Quantifying VF sensitivities at lateral gaze positions is feasible and may reveal age-related differences.
- Abduction fixation may enhance visual sensitivity in elderly individuals, offering new diagnostic insights.
- This protocol could improve understanding of visual function during horizontal eye movements in various ocular conditions.
